Display apparatus and control method thereof

ABSTRACT

A display apparatus, includes: a display unit; a signal receiving unit which receives a video signal; a signal processing unit which processes the video signal received by the signal receiving unit to be displayed; an input unit through which a frame rate demonstration function is selectable; and a control unit which controls the signal processing unit so that the video signal is processed into an inherent frame rate of the video signal and at least one corrected frame rate which is different from the inherent frame rate to be displayed in different areas of the display unit if the frame rate demonstration function is selected through the input unit.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a continuation application of U.S. patent application Ser. No.11/950,170 filed in the U.S. Patent and Trademark Office on Dec. 4,2007, which claims priority from Korean Patent Application No.10-2007-0069012, filed on Jul. 10, 2007 in the Korean IntellectualProperty Office, the disclosures of which are incorporated herein byreference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Apparatuses and methods consistent with the present invention relate todisplay of a film video signal on display apparatus.

2. Description of the Related Art

Recently, as a screen size of a display apparatus, such as a plasmadisplay panel (PDP) and a liquid crystal display (LCD), has increases,many users watch movies through the display apparatus at home ratherthan going to a movie theater.

In general, a movie showed at the movie theater, i.e., a film videosignal, is generated to have 24 or 25 frames per second, and thegenerated frames are respectively stored in a film to be displayed on ascreen by a progressive scan method. The progressive scan method is todisplay a single screen on the screen at once by a frame unit.

However, most display apparatuses currently employ an interlace scanmethod in which the single screen is divided into more than two fieldsto be displayed on the screen in sequence. According to a transmissiontype, these display apparatuses process video by 60 fields per second incase of a National Television System Committee (NTSC) standard, andprocess the video by 50 fields per second in case of a SequentialCouleur a Memoire (SECAM) standard to be displayed on the screen.

Accordingly, due to the above difference, if the film video signal isplayed by the display apparatuses, a user is not able to watch a normalfilm video because the number of the frames displayed per second isdifferent. To solve this problem, video processing for changing a framerate of the film video, and increasing the number of the frames isnecessary.

SUMMARY OF THE INVENTION

The present invention provides a display apparatus and a control methodthereof enabling a user to recognize a display environment having aframe rate which varies.

The present invention also provides a display apparatus and a controlmethod thereof displaying a user interface information for enabling auser to directly execute, determine and change a demonstration functionof the display apparatus.

According to an aspect of the present invention, there is provided adisplay apparatus, including: a display unit; a signal receiving unitwhich receives a video signal; a signal processing unit which processesthe video signal to be displayed; a user input unit which selects aframe rate demonstration function; and a control unit which controls thesignal processing unit so that the video signal can be processed into aninherent frame rate of the video signal and at least one corrected framerate which is different from the inherent frame rate to be displayed indifferent areas of the display unit if the frame rate demonstrationfunction is selected.

The video signal may include a film video signal.

The inherent frame rate may be 24 frames per second or 25 frames persecond.

The corrected frame rate may be 30 frames per second or 25 frames persecond.

The signal processing unit may perform a 3:2 pull down or a 2:2 pulldown with respect to the video signal, and then perform a deinterlacingwith respect to the video signal which passes through the pull down.

The video signal which is processed into the inherent frame rate may bedisplayed in a first area of the display unit, and the video signalwhich is processed into the corrected frame rate may be displayed in theremaining area of the display unit.

The video signal which is processed into the inherent frame rate may bedisplayed in a picture-in-picture (PIP) configuration in the displayunit.

The display apparatus may further include a user interface generatingunit which generates a user interface information, wherein the controlunit controls the user interface generating unit so that a menu windowwhich sets and changes a demonstration time for which the frame ratedemonstration function is performed, and adjusts a type or a size of anarea to display the video signal, which is processed into the inherentframe rate and the corrected frame rate, in the display unit if theframe rate demonstration function is selected.

The control unit may control the signal processing unit so that thevideo signal which is processed into the corrected frame rate can bedisplayed in an entire area of the display unit if a predetermineddemonstration time elapses after the frame rate demonstration functionis performed.

The display apparatus may further include a user interface generatingunit which generates a user interface information, wherein the controlunit controls the user interface generating unit so that an endinforming window which ends the frame rate demonstration function can bedisplayed in the display unit if a predetermined demonstration timeelapses after the frame rate demonstration function is performed.

The display apparatus may further include a storing unit, wherein thecontrol unit stores the received video signal in the storing unit.

According to another aspect of the present invention, there is provideda display apparatus including: a display unit; a scaler which processesa video signal; and a control unit which controls the scaler to performa frame rate demonstration function which respectively processes a filmvideo signal into an inherent frame rate of the film video signal, and acorrected frame rate which is different from the inherent frame rate tobe displayed in the display unit if the film video signal is input.

The display apparatus may further include a user input unit whichcontrols the frame rate demonstration function.

The scaler may perform a 3:2 pull down or a 2:2 pull down with respectto the film video signal, and then perform a deinterlacing with respectto the film video signal which passes through the pull down.

The film video signal which is processed into the inherent frame ratemay be displayed in a picture-on-picture (POP) configuration in thedisplay unit.

The film video signal which is processed into the inherent frame ratemay be displayed in a picture-in-picture (PIP) configuration in thedisplay unit.

According to another aspect of the present invention, there is provideda control method of a display apparatus which includes a display unit,the control method of the display apparatus including: receiving a videosignal; processing the video signal into an inherent frame rate of thevideo signal, and a corrected frame rate which is different from theinherent frame rate; and displaying the video signal which is processedinto the inherent frame rate in a first area of the display unit, anddisplaying the video signal which is processed into the corrected framerate in a second area of the display unit.

The video signal may include a film video signal.

The displaying may include displaying the video signal which isprocessed into the inherent frame rate in a picture-on-picture (POP)configuration in the display unit.

The displaying may include displaying the video signal which isprocessed into the inherent frame rate in a picture-in-picture (PIP)configuration in the display unit.

The control method may further include receiving a control signal whichperforms the frame rate demonstration function before the processing.

The processing may include performing a 3:2 pull down or a 2:2 pull downwith respect to the video signal, and then performing a deinterlacingwith respect to the video signal which passes through the pull down.

The displaying may further include displaying the video signal which isprocessed into the corrected frame rate in an entire area of the displayunit if a predetermined demonstration time elapses.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of the present invention will become apparentand more readily appreciated from the following description of theexemplary embodiments, taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a control block diagram of a display apparatus according to afirst exemplary embodiment of the present invention;

FIG. 2 illustrates a signal processing of a signal processing unitaccording to the first exemplary embodiment of the present invention;

FIG. 3 illustrates a frame rate demonstration image of the displayapparatus according to the first exemplary embodiment of the presentinvention;

FIG. 4 illustrates another frame rate demonstration image of the displayapparatus according to the first exemplary embodiment of the presentinvention;

FIG. 5 is a control flowchart illustrating a control method of thedisplay apparatus according to the first exemplary embodiment of thepresent invention;

FIG. 6 is a control block diagram of a display apparatus according to asecond exemplary embodiment of the present invention;

FIG. 7 illustrates a user interface information of the display apparatusaccording to the second exemplary embodiment of the present invention;and

FIG. 8 illustrates another user interface information of the displayapparatus according to the second exemplary embodiment of the presentinvention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION

Reference will now be made in detail to the embodiments of the presentinvention, examples of which are illustrated in the accompanyingdrawings, wherein like reference numerals refer to like elementsthroughout. The exemplary embodiments are described below so as toexplain the present invention by referring to the figures.

FIG. 1 is a control block diagram of a display apparatus according to afirst exemplary embodiment of the present invention. As shown therein,the display apparatus includes a signal receiving unit 10, a storingunit 20, a signal processing unit 30, a display unit 40, a user inputunit 50 and a control unit 60 controlling these. The display apparatusaccording to the present exemplary embodiment may include a plasmadisplay panel (PDP), a liquid crystal display (LCD) panel or other knowndisplay panel employing progressive scanning, and displays videocorresponding to 60 fields per second according to the NTSC standard.

The signal receiving unit 10 receives a video signal from an externalsource. The video signal received by the signal receiving unit 10 mayinclude a broadcasting signal or a video signal received from an audiovideo device such as a digital versatile disk (DVD), and may include avideo signal stored in the display apparatus. The signal receiving unit10 may further include a tuner that tunes the broadcasting signal, or amodule that receives and decodes a digital broadcasting signal. Also,the signal receiving unit 10 may include a connection port and a videointerface connected with the audio video device.

The storing unit 20 stores the video signal received under a control ofthe control unit 60. Since a signal processing is necessary if thereceived video signal has a frame rate that is different from a framerate supportable by the display apparatus, the video signal is stored inthe storing unit 20 in advance.

The signal processing unit 30 processes the received video signal, andoutputs the processed video to be displayed by the display unit 40. Thesignal processing unit 30 may be provided as a scaler that scales thevideo signal to correspond to a format of the display unit 40. Thescaler counts the number of frames of the input video signal per secondto determine an inherent frame rate.

If the input video signal has 60 fields per second, that is, the framerate of 30 frames per second, the signal processing unit 30appropriately processes the video signal so that the video signal of 60fields per second can be displayed in the display unit 40.

On the other hand, if the inherent frame rate of the input video signalis not 30 frames per second, the signal processing unit 30 processes thevideo signal so that the frame rate of the video signal can be changedto be a corrected frame rate, that is, 30 frames per second. If theframe rate of the input video signal is over 30 frames per second,duplicate or similar video signals may be extracted to reduce the framerate. If the frame rate of the input video signal is under 30 frames persecond, the video signal by frame is synthesized or newly generated toincrease the frame rate.

FIG. 2 illustrates a signal processing of the signal processing unit 30according to the first exemplary embodiment of the present invention. Inthe present exemplary embodiment, the video signal is a film videosignal having the inherent frame rate of 24 frames per second. Toappropriately replay the film video signal, the signal processing unit30 processes the video signal into the corrected frame rate instead ofthe inherent frame rate. If the signal processing unit 30 processes thevideo signal in the inherent frame rate, the video signal displayed inthe display unit 40 is incapable of being smoothly connected betweenscreens. Especially, since a motion video is interrupted, a user isincapable of normally watching the film video signal.

At first, the signal processing unit 30 performs a 3:2 pull down withrespect to the film video signal, and increases the number of fields ofthe video signal. To obtain the 60 fields from 24 frames per second,five fields are obtained from two frames (frame 1 and frame 2). A videosignal processing process obtaining three fields such as a top field(T1), a bottom field (B1) and a top field (T1) from the frame 1, andobtaining a top field (T2), a bottom field (B2) from the frame 2 refersto the 3:2 pull down or a telecine process. One of the top field and thebottom field is repeated to obtain three fields from a single frame ofthe film video signal.

The signal processing unit 30 performs a deinterlacing with respect tothe video signal so that the video signal obtained through the 3:2 pulldown can be displayed in the progressive scan mode. The deinterlacingchanges the video signal of an interlacing format to have theprogressive format, and is known as an inverse telecine. Thedeinterlacing of the video signal has various methods and may combine aplurality of fields to form a new frame. The signal processing unit 30performs a motion compensation presuming motion from video of more thantwo sequential fields by making a middle video to prevent a motionjudder typically occurring in the video signal formed through thedeinterlacing. That is, as shown therein, a first progressive frame P-f1is formed based on the top field T1 and the bottom field B1 of the frame1, and a second progressive frame P-f2 is formed based on the bottomfield B1 and the top field T1 of the frame 1, and the bottom field B2 ofthe frame 2. The first progressive frame P-f1 reproduces the videosignal of the frame 1 as it is, but the second progressive frame P-f2 isthe video signal newly formed with a consideration of motion between thevideo signals. In this manner, 60 progressive frames are formed persecond by performing the deinterlacing with respect to the film videosignal, and consequently, the video signal is processed into thecorrected frame rate to be displayed. If the corrected frame asdescribed above is formed with a consideration of the motion of thevideo signal, the user can watch a motion picture having an improvedquality. The video signal processing of the signal processing unit 30for preventing the motion judder may be performed by a FRC 9wxyMstandard of MICRONAS, or other known compensation frame forming methods.

If there are a plurality of frame rates which the display apparatus iscapable of supporting, the signal processing unit 30 may change theinherent frame rate into a plurality of corrected frame rates.

The display unit 40 displays the video signal output from the videoprocessing unit 30. The display unit 40 may be provided as a PDP, an LCDpanel, or other known display panel.

The user may select a frame rate demonstration function through the userinput unit 50. The frame rate demonstration function is provided tosimultaneously display the video signal processed into the correctedframe rate by the signal processing unit 30, and the video signalprocessed into the inherent frame rate in being received if it isnecessary to change the frame rate of the video signal. By employingthis demonstration function, the user can more easily understand adisplay environment of the display apparatus, and visually recognizethat the film video signal is currently processed by the displayapparatus. Since the user can easily understand a signal processingsuperiority of the signal processing unit 30, a manufacturer of thedisplay apparatus can utilize this function for marketing of the displayapparatus.

The user input unit 50 may include a abbreviated key and a touch padprovided a housing of the display apparatus, or a typical input devicesuch as a remote control device, a mouse, a keyboard, etc.

The control unit 60 controls the signal processing unit 30 so that thevideo signal can be respectively processed into the inherent frame rateand the corrected frame rate to be displayed in different areas of thedisplay unit 40 if the frame rate demonstration function is selected. Ifa control signal for the frame rate demonstration function is input tothe signal processing unit 30 which is processing the film video signal,the signal processing unit 30 displays the video signal processed intothe corrected frame rate in a first area of the display unit 40, anddisplays the video signal processed into the inherent frame rate in asecond area of the display unit 40. When the signal processing unit 30processes the film video signal into the inherent frame rate, the videosignal bypasses the 3:2 pull down process. Alternatively, the signalprocessing unit 30 may include a plurality of circuit configurations forseparately processing the video signal having different frame rates.

FIG. 3 illustrates a frame rate demonstration image of the displayapparatus according to the present exemplary embodiment of the presentinvention, and FIG. 4 illustrates another frame rate demonstration imageof the display apparatus according to the first exemplary embodiment ofthe present invention. As shown in FIG. 3, the video signal processedinto the corrected frame rate is displayed in a left area I of thedisplay unit 40, and the video signal processed into the inherent framerate is displayed in the remaining area II of the display unit 40. Thatis, two video signals are displayed in the display unit 40 in apicture-on-picture (POP) configuration. The areas I and II may have thesame sizes, or different sizes. FIG. 4 illustrates that the video signalprocessed into the inherent frame rate is displayed in apicture-in-picture (PIP) area III in the display unit 40. In the presentexemplary embodiment, since the video signal respectively processed intothe inherent frame rate and the corrected frame rate is replayed fromthe video signal stored in the storing unit 20, it is unnecessary toinclude an additional signal receiving unit for the POP or PIP screenconfigurations.

After performing the frame rate demonstration, the control unit 60displays the video signal processed into the corrected frame rate in anentire area of the display unit 40 to allow the user to watch videowithout motion judder if a predetermined demonstration time elapses.

FIG. 5 is a control flowchart illustrating a control method of thedisplay apparatus according to the present exemplary embodiment of thepresent invention.

First, the video signal is received (S10), and a selection signal forperforming the frame rate demonstration function is received from theuser input unit 50 (S20).

The signal processing unit 30 respectively processes the received videosignal into the inherent frame rate and the corrected frame rate (S30).If the inherent frame rate is smaller than the corrected frame rate, thevideo signal is formed into the 60 fields per second signal through thepull down process, and is converted into the video signal to bedisplayed in the display unit 40 through the deinterlacing process.

Then, the processed video signal is displayed in different areas of thedisplay unit 40 by each frame rate (S40). The video signal processedinto the inherent frame rate may be displayed in the POP configurationor the PIP configuration.

When the frame rate demonstration function may be selected while thevideo signal is received and displayed, the signal processing unit 30displays the video signal processed into the inherent frame rate in acertain area of the display unit 40.

After the frame rate demonstration function is performed, if apredetermined demonstration time elapses, the control unit 60 displaysthe video signal processed into the corrected frame rate in an entirearea of the display unit 40 (S50).

Alternatively, the frame rate demonstration function may beautomatically performed without being selected through the user inputunit 50 if the video signal, such as the film video signal which needs aframe rate change, is input.

Alternatively, the display apparatus may be provided as a cathode raytube (CRT) employing an interlace scan method, and in this case, thevideo signal may be processed by only the pull down process.

FIG. 6 is a control block diagram of a display apparatus according to asecond exemplary embodiment of the present invention. As shown therein,the display apparatus further includes a user interface generating unit70 that generates a user interface information under a control of acontrol unit 60.

If a frame rate demonstration function is selected through a user inputunit 50 or a film video signal is input, the control unit 60 generatesthe user interface information so that a user controls the frame ratedemonstration function, and displays this in a display unit 40.

FIG. 7 illustrates a first menu window IV according to the presentexemplary embodiment. The first menu window IV includes a demonstrationtime item A for determining and changing a demonstration time for whichthe demonstration function is performed, a demonstration image type itemB for selecting a demonstration type displaying a video signal processedinto an inherent frame rate and a corrected frame rate, and ademonstration image ratio item C for adjusting the size of a displayingarea to display the video signal processed into the inherent frame rate.The demonstration time item includes a sub item for selecting 10seconds, 30 seconds and 1 minute, and a user setting item for settingthe demonstration time. Similarly, the remaining items B and C may havea plurality of sub items. A user may determine the demonstration imagetype as one of the POP configuration and PIP configuration, anddetermine the size of the displaying area of the demonstration image,that is, the video signal processed into the inherent frame rate.

FIG. 8 illustrates a second menu window V according to the presentexemplary embodiment. If the demonstration time elapses, the controlunit 60 displays the second menu window V for ending the frame ratedemonstration function, that is, an end informing window in the displayunit 40. A user may set the demonstration time by using thedemonstration time item A in FIG. 7, and may also select whether to endthe demonstration function if the demonstration time elapses. The secondmenu window V includes a ‘yes’ item for selecting the ending, and a ‘no’item for maintaining the demonstration function. By using the user inputunit 50, the user may control a user interface unit 70 not to generatethe second menu window V. Also, in case of maintaining the demonstrationfunction, the demonstration time may be newly determined or remain theexisting one.

In addition, various user interface information generated by the userinterface generating unit 70 may be displayed to the above menu windows,and the user may control the demonstration function through the userinput unit 50.

Alternatively, the display apparatus may process and display video in 50fields per second depending on a PAL standard or a SECAM standard. Here,a film video signal passes through a 2:2 pull down process.

As described above, the exemplary embodiments of the present inventionprovides a display apparatus and a control method thereof enabling auser to easily recognize a display environment having a frame rate whichvaries.

Also, the exemplary embodiments of the present invention provides adisplay apparatus and a control method thereof displaying a userinterface information for enabling a user to directly execute, determineand change a demonstration function of the display apparatus.

Although a few exemplary embodiments of the present invention have beenshown and described, it will be appreciated by those skilled in the artthat changes may be made in these exemplary embodiments withoutdeparting from the principles and spirit of the invention, the scope ofwhich is defined in the appended claims and their equivalents.

What is claimed is:
 1. A display apparatus comprising: a display unit; asignal receiving unit which receives a video signal which comprises afilm video signal; a signal processing unit which processes the videosignal received by the signal receiving unit to be displayed on thedisplay unit; an input unit through which a frame rate demonstrationfunction is selectable; and a control unit which controls the signalprocessing unit so that the video signal is processed into an inherentframe rate of the video signal and at least one corrected frame ratewhich is different from the inherent frame rate to be displayed indifferent areas of the display unit in response to the frame ratedemonstration function being selected through the input unit, andcontrols the signal processing unit so that the video signal isprocessed into the corrected frame rate in response to the frame ratedemonstration function not being implemented, wherein when the framerate demonstration function is selected by a user, the video signalprocessed into the inherent frame rate and the video signal processedinto the corrected frame rate are simultaneously displayed in thedifferent areas of the display unit based on a user selection of a typeof display area, when the frame rate demonstration function is notselected by the user, the video signal processed into the correctedframe rate is displayed in an entire area of the display unit.
 2. Thedisplay apparatus according to claim 1, wherein the inherent frame rateis 24 frames per second or 25 frames per second.
 3. The displayapparatus according to claim 2, wherein the corrected frame rate is 30frames per second or 25 frames per second.
 4. The display apparatusaccording to claim 3, wherein the signal processing unit performs one ofa 3:2 pull down and a 2:2 pull down with respect to the video signal,and then performs deinterlacing with respect to the video signal whichsubjected to the one of the 3:2 pull down and the 2:2 pull down.
 5. Thedisplay apparatus according to claim 1, wherein the video signal whichis processed into the inherent frame rate is displayed in a first areaof the display unit, and the video signal which is processed into thecorrected frame rate is displayed in a second area of the display unitwhich is different from the first area.
 6. The display apparatusaccording to claim 1, wherein if a picture-in-picture type is selectedfrom the menu window, the video signal which is processed into theinherent frame rate is displayed in a picture-in-picture configurationon the display unit.
 7. The display apparatus according to claim 1,further comprising a user interface generating unit which generates auser interface information, wherein the control unit controls the userinterface generating unit so that the menu window which sets and changesa demonstration time for which the frame rate demonstration function isperformed, and adjusts a size of an area to display the video signal,which is processed into the inherent frame rate and the corrected framerate, on the display unit if the frame rate demonstration function isselected through the input unit.
 8. The display apparatus according toclaim 1, wherein the control unit controls the signal processing unit sothat the video signal which is processed into the corrected frame rateis displayed in the entire area of the display unit if a demonstrationtime elapses after the frame rate demonstration function is performed.9. The display apparatus according to claim 8, further comprising a userinterface generating unit which generates a user interface information,wherein the control unit controls the user interface generating unit sothat an end informing window which ends the frame rate demonstrationfunction is displayed on the display unit if the demonstration timeelapses after the frame rate demonstration function is performed. 10.The display apparatus according to claim 1, further comprising a storingunit in which the received video signal is stored under control of thecontrol unit.
 11. A display apparatus comprising: a display unit; ascaler which processes a film video signal; and a control unit whichcontrols the scaler to perform a frame rate demonstration function whichprocesses the film video signal into an inherent frame rate of the filmvideo signal and a corrected frame rate which is different from theinherent frame rate to be displayed on the display unit and controls thescaler so that the film video signal is processed into the correctedframe rate if the frame rate demonstration function is not implemented,wherein when the frame rate demonstration function is selected by auser, the film video signal processed into the inherent frame rate andthe film video signal processed into the corrected frame rate aresimultaneously displayed in the different areas of the display unitbased on a user selection of a type of display area, when the frame ratedemonstration function is not selected by the user, the video signalprocessed into the corrected frame rate is displayed in an entire areaof the display unit.
 12. The display apparatus according to claim 11,further comprising a user input unit which controls the frame ratedemonstration function.
 13. The display apparatus according to claim 11,wherein the scaler performs one of a 3:2 pull down and a 2:2 pull downwith respect to the film video signal, and then performs a deinterlacingwith respect to the film video signal which is subjected to the one ofthe 3:2 pull down and the 2:2 pull down.
 14. The display apparatusaccording to claim 11, wherein if a picture-on-picture type is selectedfrom the menu window used to select the type of the area to display thefilm video signal, the film video signal which is processed into theinherent frame rate is displayed in a picture-on-picture configurationon the display unit.
 15. The display apparatus according to claim 11,wherein if a picture-in-picture type is selected from the menu used toselect the type of the area to display the film video signal, the filmvideo signal which is processed into the inherent frame rate isdisplayed in a picture-in-picture configuration on the display unit.